roughly:
68000 = 0.1mips per mhz
68030 = 0.3mips per mhz
68040 = 1.1mips per mhz
68060 = 1.33mips per mhz
That's the only valid mips based post in the entire thread.
And, no, early (lower clocked) ARM processors did not outperform Motorola's later (higher clocked) 68K models.
Instead of raw benchmarks or mips figures you need to compare comparable software products running under an OS.